Inductance unit



O t, 13,1927 1,645,511 I c. A. BIRCH-HELD Filed Apri l 5 l 9 25 Tia. l.v

I m lllll llll ll )6 lo Patented 0a. 18, 1927.

UNITED STATES CHARLES A. BIRCH-FIELD, OF LARCHMONT, NEW YORK.

This invention relates to improvements in the construction of inductance units, coils or the like finding particular applicability and use in wireless or radio telephony or telegraphic systems.

The object of this invention is to provide inductance units in which there will be a substantial self-contained electromagnetic field or one whose electromagnetic field has substantially no disturbing influence on adjacent apparatus by diminishing to a minimum the external field thereof.

Another object of my invention resides in the provision of inductance units in which the distributed capacity and self-induction is reduced to such an extent so that in their relation to each, the coils will have a resultant radio frequency resistance conducive to giving the system in which they are used more selective and sharper tuning.

A further object of my invention resides in the provision of inductance units whose manufacture entails high degree of simplicity at the same time providing a product which is durable and inexpensive.

A still further object of my invention resides in the provision of a coil which may form the basis for the adjustable or variable coils of primary and secondary fields of a radio system or if desired, the fixed inductance or further one which may also form the basis for the fixed primary and secondary circuit of radio frequency transformer elements or the like.

A still further objectof my invention re.

sides in the provision of a new and simple manner of winding inductance units and further in a new and novel frame for wind ing the same.

To obtain these objects and such further objects as may appear or be hereinafter pointed out, I make reference to the accompanying drawing forming a part hereof, in

which: 1 Fig. 1 is a plan view of a coil frame made in accordance with my'invention. Fig. 2 is a side elevation of the shown in Fig. 1.

Fig. 3 is a plan view of a mounted coil. Fig. dis a modification in the form of a transformer. V

In the illustration shown, 10 is a frame of insulating material such as aphenolic condensation product, rubber, cardboard, wood, glass the like made in sheet form of eem= frame each other.

innncrancn UNIT.

Application filed April 3, 1925. Serial No. 20,443.

paratively small thickness. This frame has its length and width in such proportions as to be multiples of each other, and in the embodiment shown, the frame is'twice the length of the width for a purpose such as will be hereinafter described. The peripheral edges of the frame are formed with slots 11, 12, 13, 14, 15 and 16 and are cut diagonally so that when viewed at any particular point of reference, the two slots will slant in the same direction towards one face.

As shown in the illustration, 11 and 12 v will slant towards the front face towards each other. 12 and 13 will slant towards the back face towards each other. 13and 1 1 will slant towards the front face towards each other. 14 and 15 will slanttowards the back face towards each other. 16 and 11 will slant towards the back face towards The frame may be for referencepurposes divided along vertical and horizontal axes V and H intersecting at 0, then the length along the horizontal axis will be twice that of the dimension across the vertical axis. The slots 11, 12. 13, 14, 15 and 16 are positioned so as to have the vertical slots 13, 15.

12, 16 equidistant from the'vertical axis and theoutside length of the frame which is substantially equal to one-half of the width. of the frame.

A frame of this kind adapts itself readily for supporting a conductor which maybe wound continuously, and in the illustration shown in Fig. 3, starting at the slot 11 in one corner thereof, there is formed a terminal post17 forming the anchor for the conducting member 18. Thence the conducting member is positioned in the slot, 11, and the winding then proceeds from. slot 11 to '12 across the front face. from 12. tov 13 across the back face, from 13 to 14 across the front face, from 14: to 15 across the rear face, and

thence from 16 to 11 again to make a complete turn. This procedure is repeated as many times as desired in the same direction,

after which the other terminal19'is finally positioned in the binding post 20.

It will thus be observed that two adjacent geometric figures are formed. designated 21 and22 in which the conductors are all posi tioned at substantially right angles'to each other, and as hown, the conductors running from 12 w is and 15 to 16 Wlll cross other at substantially angles.

squares will be formed, the length of the frame may be multiples of the unit thus described and obtain results which will serve, equally the same purpose.

In Fig. l I have shown a modification of the device wherein the windings may be shown arranged so as to form an air-core trans or r- In this embodiment binding posts P P are shown at the lefthand side as to be interposed between the secondary ,windlngs, or one on top of each other.

forming as the terminals of the windingswhich form the primary circuit, and at the right. hand side, the binding posts SS form the terminal edges of the secondary-circuit. The primary wires may be Wound so In the il ustration sh wn, t e e ary coil designated by the letter S is shown interosed between the primary wires designated hyth'e l t P-v It will thus be observed that I have pro yided an inductance unit which may be :mund continuou ly d g max mum ductance n a; u n i l un -p an but y reason, of. h fa t a e. c ren a a y n ant mom t n he t branc e o t geometric figures 21 22 are in opposite directions, the flux through the center of each figure will be in opposite directions and Will neutralize the other, and it will be further observed that each adjacent side offlthe geometric figures is perpendicular to each adjacentside, the self induction will be decreased to the maximum lowest degree.

Units of this type whether used in variable tuning or fixed tuning, due to the sta- 'bility and neutralized effect, are admirably suitedfor selective tuning in wireless telegraphy and telephony in a 'manner which will be obvious to those skilled in the art i for purposes of the primary or secondary f r-mers nd th like,

I claim or tickler coils, parts of variometcrs or trans- 1 inductance unit comprising a con-' ductor wound continuously and alternately in substantially parallel planes andforming a plu ality of adja en po yg n e'ure yt windings of the said figures being in oppov arranged so thatthe central site directions and forming an external field of low value and low distributed capacity.

2. An inductance unit comprising a conductcr wound continuously and alternately in substantially parallel planes and forming a plurality of interconnected substantially rectangular figures, the adjacent sides thereof being substantially equal. 7

3. An inductance unit comprising a conductor wound continuously in substantially parallel planes and forming two adjacent polygonal figures havlng a common polnt,

the windings thereof being in'opposite directions and forming an external field of low value. 7

4. An inductance unit comprising a conductor wound continuously upon a thin frame of a non-conducting material upon Opposite sides thereof, in the form of a plurality of rectangular figures delineating substantially a figure 8, the windings on each side being in substantially parallel planes and each equal to the winding onthe other side. j

5. A transformer comprising i a primary conductor wound continuously and alternately in substantially parallel planes and forming, a plurality of adjacent geometric figures,

the windings thereof being in oppositedirections, and a secondary conductor similarly wound interposed between the first named W,

windings.

V An inductance unit comprising a con- 9 'ductor wound upon opposite s'idesof a thin frame and continuously in the shape of a plurality of rectangular geometric figures occupylng substantially parallel planes and figures is rectilinear. I

-7. An inductance unit comprising a con ductor wound continuously upon a thin frame Qfnon-conducting material, upon.op-

axis joining such posite sidesthereof in the form of a plurality adjacent rectangular figures, the windings on each side of sa d frame being in substan tially parallel planes and each equal to the windings on the other side, adjacent lengths of conductor being on opposite s desof the 1 frame and rectangularly disposed to each, other, with the wind ngs in "the adjacent geometric figures oppositely: (lISPO-SQCl.

a slotted frame and a conductor wound on both s des thereof and passing through the slots to fornr a plurality of connected figures of substantially rectangular shape, the wind ings on one sidebeing substantiallyrectangularly disposed with respect to thewindinns n the ther de,

In" testimony whereof I have hereunto signed my name.

CHARLES A. B son-risen.

8. In a device of the character described, 7 

